org.apache.kafka.streams.processor.internals.DefaultStreamPartitioner Maven / Gradle / Ivy
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* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.kafka.streams.processor.internals;
import org.apache.kafka.clients.producer.internals.BuiltInPartitioner;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.streams.processor.StreamPartitioner;
public class DefaultStreamPartitioner implements StreamPartitioner {
private final Serializer keySerializer;
public DefaultStreamPartitioner(final Serializer keySerializer) {
this.keySerializer = keySerializer;
}
@Override
@Deprecated
public Integer partition(final String topic, final K key, final V value, final int numPartitions) {
final byte[] keyBytes = keySerializer.serialize(topic, key);
// if the key bytes are not available, we just return null to let the producer to decide
// which partition to send internally; otherwise stick with the same built-in partitioner
// util functions that producer used to make sure its behavior is consistent with the producer
if (keyBytes == null) {
return null;
} else {
return BuiltInPartitioner.partitionForKey(keyBytes, numPartitions);
}
}
}